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Microstructure and mechanical property of TC4/30CrMnSiNi2A dissimilar materials brazed joints
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School of Astronautics, Northwestern Polytechnical University

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    Abstract:

    TC4 titanium alloy was brazed to 30CrMnSiNi2A ultra-high strength steel by Ti-37.5Zr-15Cu-10Ni and Ag-Cu28 brazing filler metals respectively. Microstructure and mechanical property of both brazed joints were analyzed comparatively. Results show that Ag-Cu28 brazed interface is composed of Ag(s,s) and intermetallic compounds in Ti-Cu system. Ag-Cu28 brazed joint has relatively high shear strength due to the exisitence of Ag based solid solution and the shear fracture shows the characteristics of ductile fracture. Ti-37.5Zr-15Cu-10Ni brazed interface consists of Ti-Zr solid solution and solidified brazing filler metals, which lead to the low hear strength of brazed joint. The shear fracture of Ti-37.5Zr-15Cu-10Ni brazed joint shows the characteristics of brittle fracture. Compared with Ti-based brazing filler metal, Ag-based brazing filler metal is suitable for brazing TC4 titanium / 30CrMnSiNi2A ultra-high strength steel dissimilar materials. Sound brazed joints with the shear strength of 125.52MPa can be attained at the brazing temperature of 830℃ with the bolding time of 15 min by Ag-Cu28 brazing filler metals.

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[Yue Xishan, Xie Zonghong, Xu Wenhao. Microstructure and mechanical property of TC4/30CrMnSiNi2A dissimilar materials brazed joints[J]. Rare Metal Materials and Engineering,2019,48(9):3035~3040.]
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History
  • Received:April 10,2018
  • Revised:May 18,2018
  • Adopted:June 15,2018
  • Online: October 09,2019
  • Published: